Tbi conversion help

[yevgenievich]

I have a wiring harness for the 747 as well if you want to try that route. Will pm

 

[Tonyorlo]

I like that much better than trying to mess with burning proms and sourcing the correct ecu. Should the ignition and everything else plug into the current engines components?

 

[yevgenievich]

pm sent. here is the link to the harness:
http://www.gmsquarebody.com/forum/showthread.php?t=16553

The computer is from the same suburban. I believe everything should plug in, but not sure if I still have the external esc.

 

[1987 GMC Jimmy]

I like that much better than trying to mess with burning proms and sourcing the correct ecu. Should the ignition and everything else plug into the current engines components?

I like that idea better, too. Everything's gonna be the same, I think. I doubt you'd have the round style TPS sensor so that should be okay. The 7747 is a much better option. If the ESC ever fails, you don't have to replace the whole computer, it's easy to tune, and there's a lot of support out there. Plus, if you want, you can make your own ALDL to USB cable and do system checks, data logging, and tuning. I hope it works out. Here's a great thread by @Georgeb. Inspired me to do the same thing. http://www.gmsquarebody.com/forum/showthread.php?t=13194

 

[Tonyorlo]

Viktor is going to hook me up with a harness and ecu. I'll check everything out on the stand before I drop the engine in. The engine has sat for 10+ years in a garage. I will pull the valve covers and oil pan just to check it out. I considered buying a throttle body, viktor recommended I freshen the one I have up so I will definetly do that.

I really like the idea of being able to data log and make adjustments myself too. I would like to maybe throw a set of headers on the engine someday. Being that I won't have catalytic converters will that throw a code?

 

[1987 GMC Jimmy]

Viktor is going to hook me up with a harness and ecu. I'll check everything out on the stand before I drop the engine in. The engine has sat for 10+ years in a garage. I will pull the valve covers and oil pan just to check it out. I considered buying a throttle body, viktor recommended I freshen the one I have up so I will definetly do that.

I really like the idea of being able to data log and make adjustments myself too. I would like to maybe throw a set of headers on the engine someday. Being that I won't have catalytic converters will that throw a code?

Nope. The O2 sensor is pre-cat.

 

[yevgenievich]

Viktor is going to hook me up with a harness and ecu. I'll check everything out on the stand before I drop the engine in. The engine has sat for 10+ years in a garage. I will pull the valve covers and oil pan just to check it out. I considered buying a throttle body, viktor recommended I freshen the one I have up so I will definetly do that.

I really like the idea of being able to data log and make adjustments myself too. I would like to maybe throw a set of headers on the engine someday. Being that I won't have catalytic converters will that throw a code?

Sitting for so long, also test the injectors. Soak them for some time, then can comnect one pin to 12 v and tap ground wire on the other pin. Should hear a click. But do not hold power applied, just tap very quickly. If no click, tap on inject with a screwdriver handle or the like and try again.

 

[Tonyorlo]

Ok, I haven't priced out injectors, are they expensive? I'm going to use a inline fuel pump for now, when I switch to in tank pumps is there a factory switch option for the dual tanks?

 

[yevgenievich]

All parts from 87 trucks with dual tanks will swap over. Injector prices vary, yours might be good after cleaning.(new/rebuilt $80-$150 range) you might consider getting one tank replaced with 87 one and run intank fuel pump from the start. Then later get the other one switched over.

 

[1987 GMC Jimmy]

If you want to do like an ultrasonic type cleaning, WitchHunter performance does that and flow tests them for $22 a pop. It's a gamble, but it'd be a little less than half of what you'd pay for new ones. I've never used them, but I know folks on here have.

 

[Tonyorlo]

I think for now I will take the gamble with the injector. That is above option rather than buying a new one if I honk it's just clogged.

Can I drop a later sending unit in the early tank?

 

[yevgenievich]

I think for now I will take the gamble with the injector. That is above option rather than buying a new one if I honk it's just clogged.

Can I drop a later sending unit in the early tank?

Better to swap tanks because efi tank has a baffle, while ofiginal carb tank does not.

 

[Tonyorlo]

Ok. Well I really have no use for 2 tanks, so I will most likely eliminate a tank when I do this. A quick glance at rockauto looks like I will have about $120-$150 in a new tank, sending unit, and pump.

 

[4WDKC]

Ok. Well I really have no use for 2 tanks, so I will most likely eliminate a tank when I do this. A quick glance at rockauto looks like I will have about $120-$150 in a new tank, sending unit, and pump.

I would recommend you look around for a pump that can withstand higher PSI, I put a stock replacement in mine and now to increase the HP I need higher pressure pump.

 

[Tonyorlo]

Will you need to run a regulator with a aftermarket pump?